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Updated: May 15, 2026
Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
840 mW continuous-wave Fe:ZnSe laser operating at 4140 nm
Jonathan W Evans1, Patrick A Berry, Kenneth L Schepler
1Air Force Research Laboratory, Sensors Directorate, 2241 Avionics Circle, Wright-Patterson AFB, Ohio 45433, USA. jonathan.evans@wpafb.af.mil
Abstract:
We report the demonstration of high-power (840 mW) continuous-wave laser oscillation from Fe2+ ions in zinc selenide. The output spectrum of the Fe:ZnSe laser had a line-center near 4140 nm with a linewidth of 80 nm. The beam quality was measured to be M2≤1.2 with a maximum slope efficiency of 47%. Small shifts observed in output wavelength with increased output power were attributed to thermal effects. No thermal roll-off of slope efficiency was observed at the maximum of output power.
